We are ready send him back full refund - in case he will delete his fake reviews!
You have the email address that he used during registration, you will easily get in touch.
Also, it should not be conditional, because he can easily write a new review again after the refund. What prevents him from making 5 different fake reviews? How are you going to charge him for that?
If I leave feedback on your account that warns of unjustified account suspension and stops the withdrawal of funds, will you also block my account?
You can leave an honest review—that’s completely fine, even if you don’t like our service. It’s your right as a customer. However, perhaps you missed our previous messages where we explained what he actually did?